CN1802760A

CN1802760A - Seal for a pressurized container

Info

Publication number: CN1802760A
Application number: CNA2004800064525A
Authority: CN
Inventors: R·M·詹米
Original assignee: Eveready Battery Co Inc
Current assignee: Edgewell Personal Care Brands LLC
Priority date: 2003-03-11
Filing date: 2004-02-23
Publication date: 2006-07-12
Also published as: WO2004082045A3; JP2006521678A; US6733917B1; EP1604414A2; WO2004082045A2

Abstract

A pressurized container with a vent assembly that reliably prevents resealing of a vented seal member is provided. In one embodiment, the vent assembly seals the end of a container that includes a first electrode, a second electrode, a separator located between the first and second electrodes and an electrolyte in contact with the electrodes and separator. The seal member includes at least two protrusions on the surface of the seal member. The protrusions define and maintain a gap between the cover and seal member after the seal member has ruptured thereby allowing pressure within the container to be reduced.

Description

The seal of pressure vessel

Technical field

But the present invention relates generally to the vent closure of pressure vessel, more specifically, but relates to the vent closure of the electrochemical cell of airtight sealing.

Background technology

Pressure vessel obtains using in application fields.These comprise in using: the aerosol injection container; The hold-up vessel of normally used Compressed Gas in the industrial environment; And the cylindrical battery that comprises electrochemical active material, when reacting, described electrochemical active material produces gas between chemical substance.Millions of consumers buys the pressure vessel that is used for forming in essence to the battery of various power devices a class uniqueness, described pressure vessel must tolerate very high internal pressure, also must be included in the rupturable exhaust outlet that gas can therefrom be discharged under the excessive situation of pressure simultaneously.If pressure vessel does not have reliable rupturable exhaust outlet, and pressure surpasses the bursting strength of container, and then container may be with unpredictable and have potential destructive mode and break.

Electrochemical cell, for example cylindrical alkaline electrochemical cell is used two kinds of electrochemical active materials and a kind of aqueous electrolyte.Electrochemical active material is typically manganese dioxide and zinc.These materials are contained in the elongated hydrostatic column usually, and described container one end opening is so that electrochemical active material and electrolyte can be inserted into wherein in the battery production process.The openend of container is by comprising the disc flexible sealing component, rigid inner cover and stretch out the closed component sealing of the elongated metal collector at the center by containment member.Be crimped onto by end on the periphery of containment member, and this closed component be fixed on the openend of container container.The sealing member generally includes a hub around current collector, and the barrier film with the integrally moulded shaping in central area of seal.The effect of barrier film is to break when internal pressure is too high and gas is discharged from battery.Current collector provides zinc and the conductive path between an end cap of battery one end.

Product performance in multiple battery electric supply installation the constantly effort of the manufacturer of electrochemical cell for improving them.The main purpose of most of battery manufacturers is the time to power devices of improving battery.A kind of strategy of realizing this goal is exactly to make the non-electrochemical active component, and as the gas deflation assembly of battery, shared volume minimizes, thereby reserves more space in battery the electro-chemical activity parts.In recent years, by gas deflation assembly being redesigned so that this gas deflation assembly needs less components, gas deflation assembly has obtained bigger volume efficiency, simultaneously gas deflation assembly than formerly more known gas deflation assembly work more reliable.Because it is the shared volume of gas deflation assembly reduced, just more obvious to the problem that other parts of gas deflation assembly " reseal " by ventilative containment member.This problem is the most common in primary cell, and described primary cell is also referred to as not rechargeable battery under by the situation of other battery charge.Though most batteries use with tradition side, the sub-fraction battery may be abused, and for example primary cell by mistake is placed in the device, and the positive pole and the negative pole of battery are put upside down.For example save from the battery-powered flashlight of type alkaline electro, may produce this problem in some employings that can buy 8.Typically, battery be inserted into two each can hold in the elongated chamber of 4 batteries.According to the operation instruction of flashlight, battery must insert in " series connection " mode, and the meaning is exactly that the positive pole of a batteries and the negative pole of an adjacent batteries contact.Unfortunately, some consumers do not operate according to the operation instruction that identifies on the common equipment and unexpectedly certain battery had been fallen.If the second or the 3rd batteries in the chamber that holds 4 batteries this thing happens, so when position that flashlight switch is pulled to out, the battery that falls to insert will be by a joint or the correct battery charge of placing of more piece more.Can in battery, produce a large amount of heats and gas to the battery charge of falling to insert.For instance, the external temperature of battery may be above 65 degrees centigrade.The rising of temperature is risen the pressure in the battery.Except battery temperature rose, the gas that the chemical reaction of the generation in the battery charging process produces greatly improved the pressure in the battery.The generation of simultaneous gas and temperature raise and cause usually elastic sealing element deliquescing of being made by nylon and the structural rigidity that loses part.But the thin discharge portion of seal may since the rising of being heated with internal pressure of nylon be elongated.Therefore, when the seal of softening transform breaks because of pressure raises, the gas of a beginning part can discharge in battery, but after the smooth inner surface of softening seal that breaks and end cap contacted and end cap resealed, splitting of the seal that breaks located and may be resealed.This problem is especially outstanding for the gas deflation assembly of small size, and wherein containment member and other parts are very little as the distance between the battery cover.If the seal that breaks reseals the residence and states lid and battery continuation generation gas, the crimping of battery finally may be burst so, and wherein the curling connecting portion between seal and the container breaks, and gas deflation assembly is effectively discharged from container.

According to american documentation literature US6,270, the description of 919B1, the seal that prevents to break reseals comprises seal inner circular dish type partly changed in preceding trial and is provided with rib.Being designed for of rib keeps opening of the seal break, thereby prevents that exhaust gear from being resealed.Yet, though being set, rib helps to prevent that generation from resealing on the barrier film of seal in most of batteries, but some battery that is provided with rib but may be out of shape because of the heat that produces in the charging process, makes rib can not make seal keep opening in the back of breaking.

At american documentation literature US6,312, among the embodiment of the disclosed seal of 850B1, on the surface of the compression element of a part that forms black box, be provided with vertical groove.These grooves are designed to prevent that the barrier film generation of vent closure from resealing.These grooves form the passage that allows gas to discharge, thereby prevent that the generation of exhaust barrier film from resealing.Though this embodiment can prevent that barrier film from resealing on the surface that abuts in compression element, the barrier film after these grooves but can not prevent to tear reseals on the inner surface that abuts in end cover for battery cells.

American documentation literature US6,270,918B1 discloses containment member of a kind of use and a black box that is provided with the inner cap in hole.The sealing member is directly in abutting connection with inner cap.Enclosing cover is fixed on the sealing assembly and forms the contact terminal of battery.Surpass the limit of allowing if the pressure of battery raises, containment member breaks, and allows gas to discharge by the hole on inner cap and the contact terminal thus.Though described black box makes electrochemical cell be able to exhaust safely, the sealing assembly depends on the use of inner cap.Unfortunately, inner cap occupies certain space in battery, and this space can be used to store more electrochemical active material originally better.

Therefore, need a kind of gas deflation assembly of making of cheaply and simply being easy to, described gas deflation assembly is at pressure vessel, as occupying minimum volume in the electrochemical cell, and can prevent reliably that vent closure from resealing.

Summary of the invention

The invention provides a kind of pressure vessel that can reliably prevent the gas deflation assembly that the exhaust sealing member reseals that has.This gas deflation assembly occupies minimum space in container and manufacturing cost is lower.

In one embodiment, the present invention is a pressure vessel.This container comprises wall portion, and described wall portion defines the opening that penetrates described wall portion.Gas deflation assembly is fixed in the wall of a container portion and airtight described opening.This assembly comprises a rigid cap and a rupturable containment member.Described lid limits a hole that passes therethrough and is positioned at wall portion opening.The sealing member is that flexible disk shape is rupturable, and is covered on the opening of container.The sealing member has a rupturable diaphragm area of annular, its with one heart with described register.Barrier film is positioned at the below of lid, and be set at and the contacted containment member periphery of container and self sealss member between the outstanding center atubular extension portion of lid.This extension and diaphragm area adjoin each other and form 360 ° interface.The upper surface of diaphragm area is positioned at a containment member side of close lid.On the upper surface of barrier film, have two protuberances at least.Described protuberance is apart from the interface certain distance of barrier film and extension, guarantees the overslaugh that the annular section of the broken barrier film of contiguous extension keeps not being subjected to described protuberance thus.Described protuberance is set contacts with described lid with the increase of response container inner pressure, the increase of this pressure cause barrier film along 360 ° of interfaces and extension from.After containment member broke, described protuberance limited and remains on the gap between barrier film and the lid.Pressure in the container is along with the containment member of the gas in the container by breaking, and then by the gap between containment member and the lid, reduces by the hole discharge that covers again.

Description of drawings

Fig. 1 is the perspective view of the containment member of employed not exhaust in the pressure vessel of the present invention;

Fig. 2 is the vertical view of containment member shown in Figure 1;

Fig. 3 is the longitudinal sectional drawing that comprises the pressure vessel of the present invention of containment member shown in Figure 1;

Fig. 4 is the profile of the containment member of employed not exhaust in the electrochemical cell of the present invention; And

Fig. 5 is the longitudinal sectional drawing that comprises the electrochemical cell of the present invention of containment member shown in Figure 4.

Embodiment

Fig. 1 to Fig. 6 shows containment member and comprises the various views of the pressure vessel of a described containment member.In a word, how these accompanying drawings and following explanation instruction those skilled in the art put into practice the present invention of request right protection.On the one hand, the present invention is a pressure vessel 50 with gas deflation assembly 52, and described gas deflation assembly 52 comprises a containment member 10 and at least one lid 42.Gas deflation assembly covers on the opening 54 in the pressure vessel wall portion 56 and is fixed on the container.The function of gas deflation assembly is by pressure actuated safety valve, discharges the pressure in the container when pressure surpasses predetermined value.Containment member 10 has the design that can break along the line of weakness 32 in the diaphragm area 28 of containment member.The barrier film that is torn responds the gas of discharging in the container and subsequently towards lid 42 bendings.Owing to have the two or

more protuberances

22 and 24 that stretch out from the upper surface 14 of containment member, make that the barrier film after tearing can not contact with lid.The position of this protuberance and shape limit and the barrier film that kept tearing and lid between the gap, thereby the gas in the container is discharged by the sealing member.Hole 58 in the lid makes and enters outside the gas discharge cap in the lid atmosphere on every side.Below the present invention will be described in more detail.

With reference to accompanying drawing, particularly Fig. 1 there is shown and is applicable to pressure vessel of the present invention, as the perspective view of the containment member in the electrochemical cell 10.The sealing member is discoidal single part haply, and its external diameter is basically greater than its thickness.The sealing member comprises several zones and/or functional part, but this makes the sealing member possess the function as the rupture valve in the pressure vessel.The periphery of containment member 10 is upright wall portion 12.Wall portion 12 surfaces are substantially perpendicular to the upper surface 14 and the lower surface (not shown) of disc containment member.From wall portion 12 inwardly be provided with abuts with wall portion 12 and with first annular region 16 of the centres of containment member 10.Circular spine 18 is in abutting connection with first annular region.What be set up in parallel with spine 18 is centroclinal annular region 20 towards containment member.On the surface in zone 20, be provided with at least two protuberances.First protuberance 22 and second protuberance 24 approximately are 120 ° each other.As will be described, definite quantity, size, shape and the position of protuberance can change, to adapt to the design of rubber seal parameter, for example the external diameter of seal, design of rubber seal exhaust pressure, make the used material of seal etc.20 radially inwardly is second annulus 26 from the circle, this zone with zone 20 with separate in abutting connection with the diaphragm region 28 of extension 30.The thickness in zone 28 is uneven.The groove 32 (as shown in Figure 3) of zone on 28 lower surfaces forms an encapsulant ring with the attenuation of the centres of extension 30, the centres of this extension 30 and containment member 10.When containment member 10 breaks under the effect that internal pressure increases, the sealing member splits along groove 32, make the radially outer part of extension and containment member 10 thus, for

example protuberance

22 and 24, first annular region 16 and upright wall portion 12 separate at least in part.Groove 32 can be in any position between the junction of the circumferential surface of extension and second annular region 26 and diaphragm area 28.

In an embodiment of the containment member shown in Fig. 1, protuberance is positioned on the upper surface of containment member.Although other embodiment also is possible, need to consider that some specific design standard plays suitable effect to guarantee containment member.At first, the groove on the lower surface of diaphragm area 28 should be provided with around extension 30, will form circular tearing mark like this when its exhaust.Preferably, this behavior of tearing forms 360 ° tearing mark around extension.But, can play effect greater than 270 ° tear also less than 360 °.The second, between groove and arbitrary protuberance, a clog-free distance must be arranged, the meaning of terminology used here " accessible " is the physical component that does not hinder containment member to tear along groove 32.In the embodiment shown in fig. 1, second annular region 26 provides the unobstructed distance between groove and the protuberance.The 3rd, two protuberances must be arranged at least, and the relative position of these protuberances must be set, to guarantee forming and keep a gap tearing between edge and the lid of seal ruptures metacneme.The gap appears at distance the shortest between the protuberance.Opened if separate between the protuberance, barrier film tears the edge and will contact the bottom surface of lid and produce and reseal so.If only adopt a protuberance, the barrier film of tearing so can stress novel sealing at any one of protuberance and abut in and cover.Therefore, containment member must comprise two or more protuberances.The 4th, protuberance necessarily can not form continuous or approximately continuous barrier on every side at the diaphragm tears place.The 5th, center extension must have enough height, thus can be directly or indirect contact be positioned at lid on the seal upper surface.

The position that can change protuberance is to adapt with its quantity.Two protuberances can be close to the space 20 ° or as far as the space 180 °.By observing the upper surface of seal, be also referred to as " vertical view ", then, the angle that definite straight line that draws from center to the center of extension of each protuberance forms, thereby the position of definite protuberance.Referring to Fig. 2, suitable protuberance position is respectively at a distance of 45 °, and 60 °, 90 °, 120 ° or 180 °.Preferably, all protuberances are identical with the distance at containment member center.In AA type battery, its size is roughly 14.5 millimeters of diameters, and is high 50.5 millimeters, in inserting battery case before, the diameter of containment member is 14.3 millimeters, and preferably, has 120 ° three protuberances of being separated by.

As long as protuberance can play the effect that keeps the gap between lid and the containment member after containment member breaks, the shape of protuberance is unimportant so.As shown in Figure 1, feasible is, protuberance can be rectangular haply, cylindrical, three-side cone shape or four sides cone-shaped.Preferably, protuberance from the bottom of protuberance to the end convergent of the protuberance of approaching lid.Preferred protuberance is shaped as cone-shaped.The protuberance of cone-shaped has the bottom of four sides.Four are roughly leg-of-mutton side and extend from the bottom towards a common summit, and this common summit is the far-end of protuberance.Protuberance 24 shown in Figure 1 has 36, the three sides 38,34, the second sides, first side and the 4th side 40.The shape of first side 34 and second side 36 is consistent with each other.The 3rd side 38 is different mutually with the shape of the 4th side 40, and is also inequality with first side and second side.A little tabular surface is accomplished on the summit of protuberance, contacts with lid after membrane ruptures at this tabular surface place protuberance.Although containment member illustrated in fig. 1 has three protuberances that size is identical with shape, containment member also can comprise the protuberance of different sizes and/or shape.For example, a containment member that is provided with four protuberances of equidistantly being separated by can comprise the protuberance of two cone-shaped and the protuberance of two rectangles.

Extension 30 is positioned at the center of containment member 10.As shown in Figure 3, the effect of extension 30 is to be used for and to cover 42 contacting, thereby forms the exhaust activation zone between lid 42 and diaphragm area 28.This exhaust activation zone need provide the space that makes membrane ruptures and move towards lid when the compressed air in the container is discharged by the barrier film that splits.Preferably, this extension is a cylindrical shape, when the internal pressure of battery increases, can apply uniform drag to barrier film like this.The center of extension 30 can be solid as shown in Figure 1, can be hollow as shown in Figure 4 also perhaps.If the center of extension is hollow, another structural detail can be inserted in the tubular openings that is limited by extension so.A kind of suitable structural detail can be the current collector 44 shown in Fig. 5, and Fig. 5 shows the profile of electrochemical cell.

It is mold formed that containment member can inject the die cavity with required form by the materials such as polystyrene of for example nylon, polypropylene, polysulfones or impact modification.After the cooling, the containment member that takes out from mould is a single part, and it comprises above-mentioned protuberance, extension and ventable diaphragm region at least.By when seal is mold formed, designing described containment member, just need not to adopt independent parts to cover to prevent that containment member after the exhaust from resealing to abut in to comprise protuberance.Therefore, the size of gas deflation assembly and cost just can be reduced to minimum.

As shown in Figure 5, lining 46 is the selectable parts that can use with seal 10.This lining is the hollow tubular parts that are designed to form interference engagement between lining internal diameter and extension external diameter.Select jacket wall portion thickness, so that the outer wall of lining aligns with groove 32 in the diaphragm area 28.Lining and groove aligned make lining help containment member breaking in the position of groove.

Be that at least one has been known as end cap usually and has been also referred to as the rigid structure element of first lid at this between the upper surface 14 of containment member 10 and pressure vessel surrounding environment.As shown in Figure 5, first lid is positioned at the opening 54 of container 50.If first lid covers seal, such first lid can prevent that the gas in the pressure vessel is discharged to by the sealing part in the external environment condition of battery, and therefore, first lid must limit the hole that at least one passes therethrough.Except with the extension of containment member contacts, the periphery of lid can contact with the upstanding wall portion of containment member, and this upstanding wall portion limits the periphery of containment member.In addition, between first lid and seal, can be provided with second lid.This second lid can be described as the inner cap that is used for electrochemical cell.This second lid also can limit center second hole, and the extension of a part of seal passes described hole and stretches out.

End cap 42 is cup-shaped substantially parts of being made by nickel-plated steel.Lid 42 periphery 78 is to return to form with the material that forms with the double thickness of covering 42 core 80 approximate vertical by cover self edge roll.Between the core and its periphery of lid, the profile of lid forms a series of bendings.The central area 80 of this lid is recessed with respect to the edge 82 of lid rollback.Lid reception cavity 84 (see figure 4)s that are inserted into containment member when lid 42, and gas deflation assembly is when being involved in the openend of container 50, and lid is pressed against on the inner surface of container 50 just as a spring wall portion 12 that seal is upright.Have the feature that is similar to spring by the profile that makes lid, gas deflation assembly need not to comprise that independent parts are pressed against on the container with the perisporium with containment member.

Referring to Fig. 5, there is shown the profile of an electrochemical cell that assembles of the present invention.From the outside of battery, battery component is first electrode 62 of the inner surface of container 50, adjacent vessel 50, with the inner surface 66 contacted dividing plates 64 of first electrode 62, be arranged on by dividing plate 64 and be fixed on second electrode 68 in the cavity that the gas deflation assembly 52 on the container 50 limits.Container 50 has an openend 54, a blind end 74 and a sidewall between the two 56.Blind end 74, sidewall 56 and gas deflation assembly 52 limit the cavity of an internal battery electrode.

Container 50 is made by the nickel-plated steel that is configured as the drum with a blind end and an openend.Inserted the openend of container when gas deflation assembly after, this assembly is fixed on the container by container inwardly being crimped onto on the gas deflation assembly and/or by the mode that assembly is cemented on the container.This container can be equivalent to the current collector of an electrode of battery.

First electrode 62 is manganese dioxide, graphite and the mixture that contains the aqueous solution of potassium hydroxide.The shaping of this electrode is by a certain amount of mixture is put into the openend container, with block stamp mixture is molded as then and limits a solid tube-like piece with the concentric cavity of the sidewall of container.The another kind of selection be, also the mixture preform that contains manganese dioxide can be gone out a plurality of rings, then these rings inserted in containers forming the first tubular electrode, thereby be shaped negative electrode.

Second electrode 68 is by aqueous alkaline electrolyte, zinc powder and gel such as the polyacrylic uniform homogeneous blend of crossbinding.Aqueous alkaline electrolyte comprises a kind of alkali metal hydroxide, as potassium hydroxide, NaOH or its mixture.Potassium hydroxide preferably.Be applicable to that the gel that uses in the battery of the present invention can be a kind of cross linked polyacrylate, Carbopol 940  that sell as the Noveon company in Cleveland (Cleveland) city of Ohio, USA.The example that is applicable to other gel in the alkaline electrolysis solvent has carboxymethyl cellulose, polyacrylamide and Sodium Polyacrylate.Zinc powder can be pure zinc powder or contain being selected from of appropriate amount and comprise indium, lead, bismuth, lithium, the alloy of one or more metals in the group that calcium and aluminium are formed.Suitable anode mixture comprises the alkaline electrolyte of the potassium hydroxide that wherein contains 40% percentage by weight of the gel of zinc powder, 0.50% percentage by weight of 67% percentage by weight and 32.5% percentage by weight.The scope of the amount of zinc anode weight 63% to 70% between.Also can select other component of adding in the mentioned component tabulation, as gassing corrosion inhibiter, organic or inorganic resist, adhesive or surfactant.The example of gassing corrosion inhibiter or resist can comprise indium salt (as indium hydroxide), perfluorinated alkyl ammonium salt, alkali metal sulphide etc.The example of surfactant can comprise poly(ethylene oxide), polyethylene alkyl ether, perfluoroallcyl compounds etc.Can mix by mentioned component is sneaked in silk ribbon formula mixer or the drum mixer, then this mixture is processed into wet pulp, produce second electrode.

Be applicable to that the electrolyte that uses in the battery of the present invention can be the potassium hydroxide aqueous solution of 37% percentage by weight.This electrolyte can be introduced in battery by a certain amount of fluid electrolyte is put into the cavity of being made by first electric limit.This electrolyte can also absorb the mode of potassium hydroxide aqueous solution by gel media and be introduced in the battery in the technical process of making second electrode.As long as electrolyte contacts with first electrode 62, second electrode 68 and dividing plate 64, how electrolyte being introduced battery is not key point.

Dividing plate 64 can be made by adhesive-bonded fabric.A function of dividing plate is at first and second electrodes barrier to be set at the interface.This barrier must be electric insulation and be that ion is permeable.

It below only is description of a preferred embodiment.For those skilled in the art and manufacturing and use people of the present invention, may carry out some changes to the present invention.Therefore; should be appreciated that embodiment shown in the accompanying drawing and foregoing description only can not be used to limit protection scope of the present invention for purposes of illustration, protection scope of the present invention is limited by following claim and comprises that according to patent law doctrine of equivalents makes an explanation.

Claims

1, a kind of pressure vessel, air inclusion and have wall portion and gas deflation assembly, described wall portion is provided with the circular open that passes described wall portion, and described gas deflation assembly is fixed in the wall of a container portion and airtight described opening, and described assembly comprises:

A) rigid cap limits at least one and passes wherein hole, thereby the path by described lid is provided, and described lid is positioned at the opening of described wall portion, and

B) be fixed on the container and be covered in flexible rupturable disc containment member on the opening in the container, described containment member have one with described wall of a container portion in the homocentric annular rupturable diaphragm area of aliging of opening, described barrier film is positioned at the below of lid, and the containment member periphery that contacts with container and self sealss member to lid outstanding and and diaphragm area adjoin each other between the center atubular extension portion at the interface that forms 360 °, at the interface described, described extension and described barrier film are in contact with one another, the upper surface of described rupturable diaphragm area is positioned at a containment member side of close lid, on the upper surface of barrier film, have two protuberances at least, described protuberance is apart from the interface certain distance of barrier film and extension, guarantee the overslaugh that the annular section of the broken barrier film of contiguous extension keeps not being subjected to described protuberance thus, described protuberance is set to contact with described lid with the increase of response container inner pressure, the increase of this pressure cause described barrier film along 360 ° of interfaces and described extension from, after containment member breaks, described protuberance limits and remains on the gap between barrier film and the lid, make the interior pressure of container along with the containment member of the gas in the container thus by breaking, and then, reduce by the described described hole discharge that covers again by the gap between containment member and the lid.

2, pressure vessel as claimed in claim 1, wherein when measuring based on the center of described containment member, the angle that the center of described protuberance is separated by is no more than 120 °.

3, pressure vessel as claimed in claim 1, wherein when measuring based on the center of described containment member, the angle that the center of described protuberance is separated by is no more than 90 °.

4, pressure vessel as claimed in claim 1, wherein when measuring based on the center of described containment member, the angle that the center of described protuberance is separated by is no more than 45 °.

5, pressure vessel as claimed in claim 1, wherein at least one described protuberance comprises the bottom of contiguous seal member upper surface, with the far-end of the other end that is positioned at the protuberance relative with described bottom, described protuberance convergent is to form wide bottom and narrow far-end.

6, pressure vessel as claimed in claim 5, wherein said protuberance have at least three sides towards a common summit convergent.

7, pressure vessel as claimed in claim 1 is in the beeline of wherein said gap between adjacent protuberance.

8, pressure vessel as claimed in claim 1, wherein said containment member comprises at least three protuberances.

9, pressure vessel as claimed in claim 1, wherein said containment member comprises at least four protuberances.

10, pressure vessel as claimed in claim 9, wherein said protuberance comprises all first side, second side, the 3rd side and the 4th side towards a common summit convergent, the shape of described first side and second side is consistent with each other, and the shape of described the 3rd side and the 4th side is inequality, and different too with described first side and second side.

11, pressure vessel as claimed in claim 1, being separated on the described barrier film of wherein said barrier film and described extension produce at least 270 ° tearing.

12, pressure vessel as claimed in claim 1, wherein said assembly comprises second rigid cap.

13, pressure vessel as claimed in claim 12, one of them described lid comprises at least two holes that pass therethrough.

14, pressure vessel as claimed in claim 13, one of them described hole is positioned at the center of described lid.

15, pressure vessel as claimed in claim 1, wherein said containment member are the elastomeric elements of integrally moulded shaping.

16, pressure vessel as claimed in claim 15, wherein said containment member is made by a kind of material in the group that comprises nylon, polypropylene, polysulfones and impact modified polystyrene.

17, pressure vessel as claimed in claim 1, wherein said container comprises first electrode that contacts with described container physics, and extends through contacted second electrode of conductive member, the dividing plate between described first electrode and described second electrode of described containment member extension, and with the contacted electrolyte of described electrode.

18, pressure vessel as claimed in claim 17, wherein when forming conductive path between described first electrode and described second electrode, described second electrode produces hydrogen.

19, a kind of pressure vessel has the gas deflation assembly on wall portion that limits an opening and the opening that is fixed on container, and described assembly comprises:

A) be positioned at the rigid cap of opening, and

B) be fixed on the opening of container and be positioned at the flexible rupturable containment member of described lid below, described containment member comprise when under the situation that the pressure of containment member in container increases behind the partial rupture of containment member center, the device that keeps the gap between lid and the containment member, the device in described maintenance gap comprise and are located at the lip-deep two or more protuberances of containment member of approaching lid.

20, pressure vessel as claimed in claim 19, wherein said protuberance is positioned at the position that equates with the centre distance of containment member.

21, pressure vessel as claimed in claim 19, wherein said protuberance self sealss member is towards the lid convergent.

22, pressure vessel as claimed in claim 19, wherein said lid limit at least one opening that passes therethrough.

23, pressure vessel as claimed in claim 19, the device in wherein said maintenance gap comprises an extension that is positioned at described containment member center, described extension contacts described lid.

24, as claim 23 described pressure vessels, the device in wherein said maintenance gap comprises the accessible annular section of a containment member between described extension and described protuberance.

25, pressure vessel as claimed in claim 19, wherein said container also comprises first electrode that contacts with described container physics, and extends through contacted second electrode of conductive member, the dividing plate between described first electrode and described second electrode of described containment member, and with the contacted electrolyte of described electrode.